/*
 * 广州丰石科技有限公司拥有本软件版权2020并保留所有权利。
 * Copyright 2020, Guangzhou Rich Stone Data Technologies Company Limited,
 * All rights reserved.
 */

package demo.idempotent.intercepter;

import cn.hutool.core.util.StrUtil;
import com.alibaba.fastjson.JSONObject;
import demo.idempotent.filter.RepeatedlyRequestWrapper;
import demo.service.RedisService;
import demo.utils.HttpUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
/**
 * <b><code>SameUrlDataInterceptor</code></b>
 * <p/>
 * Description
 * <p/>
 * <b>Creation Time:</b> 2020/12/28 6:00 下午.
 *
 * @author wyfd
 * @since rziomp-be 1.0.0
 */

/**
 * 判断请求url和数据是否和上一次相同，
 * 如果和上次相同，则是重复提交表单。 默认有效时间为10秒内。
 */
@Slf4j
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {

    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";

    public static final String REPEAT_SUBMIT_KEY = "repeat_submit:";
    // 令牌自定义标识
    @Value("${token.header}")
    private String header;

    @Autowired
    private RedisService redisService;

    /**
     * 间隔时间，单位:秒 默认10秒
     * <p>
     * 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
     */
    @Value("${app.intervalTime}")
    private Long intervalTime = 10L;

    public void setIntervalTime(Long intervalTime) {
        this.intervalTime = intervalTime;
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean isRepeatSubmit(HttpServletRequest request) {
        String nowParams = "";
        if (request instanceof RepeatedlyRequestWrapper) {
            RepeatedlyRequestWrapper repeatedlyRequest = (RepeatedlyRequestWrapper) request;
            nowParams = HttpUtils.getBodyString(repeatedlyRequest);
        }

        // body参数为空，获取Parameter的数据
        if (StrUtil.isEmpty(nowParams)) {
            nowParams = JSONObject.toJSONString(request.getParameterMap());
        }
        Map<String, Object> nowDataMap = new HashMap<String, Object>();
        nowDataMap.put(REPEAT_PARAMS, nowParams);
        nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());

        // 请求地址（作为存放cache的key值）
        String url = request.getRequestURI();

        // 唯一值（没有消息头则使用请求地址）
        String submitKey = request.getHeader(header);
        if (StrUtil.isEmpty(submitKey)) {
            submitKey = url;
        }

        // 唯一标识（指定key + 消息头）
        String cache_repeat_key = REPEAT_SUBMIT_KEY + submitKey;

        Object sessionObj = redisService.getObject(cache_repeat_key);
        if (sessionObj != null) {
            Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
            if (sessionMap.containsKey(url)) {
                Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
                if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap)) {
                    log.warn("{},{}", nowParams, nowDataMap);
                    return true;
                }
            }
        }
        Map<String, Object> cacheMap = new HashMap<String, Object>();
        cacheMap.put(url, nowDataMap);
        redisService.setObject(cache_repeat_key, cacheMap, intervalTime, TimeUnit.SECONDS);
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap) {
        String nowParams = (String) nowMap.get(REPEAT_PARAMS);
        String preParams = (String) preMap.get(REPEAT_PARAMS);
        return nowParams.equals(preParams);
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap) {
        long time1 = (Long) nowMap.get(REPEAT_TIME);
        long time2 = (Long) preMap.get(REPEAT_TIME);
        if ((time1 - time2) < (this.intervalTime * 1000)) {
            return true;
        }
        return false;
    }
}
